It is an unassuming, timeless marvel of mysterious origins and significant usefulness. It remains an artifact unto itself, providing illumination for those who need it in their lives, and moving on, ever ready to serve and light the darkness for the next master.
When someone befriends an animal, s/he obtains the ability to unite their souls together and take on the form of that animal as well as its abilities. S/he also gain some properties of that animal even when they are no keener t transformed, such as resistence to cold or senses. If s/he really wants to s/he can half transforms taking on characteristics of the animal and their normal form